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Roofing\venting proposals = Confused homeowner

I would go with several solar powered fans since you will have no shortage of solar power in AZ. close of the gable vents. Install plenty of eave ventillation since it looks like you have large overhangs.This will draw the air up from the lowest point and out the highest point.

Roofing\venting proposals = Confused homeowner

Hi all,
I am following some threads on vents & fan installations. i have a concrete tile roof & it primarily has 'soffit' for intake (I see continuous ventilation holes around the roof). There are 4 or 5 domer style vents near top portions of the roof. I have been thinking about adding fans just below the domer vents so that it can push air out? Installation will be very easy since I just have to get fans & install just below the domer vents (i don't plan to open the roof or anything - just use the existing vent openings). Will it help? I live in Northern California - we get a few really hot days & a few really cold days. I am wondering if adding couple of attic fans (either solar or electric powered with thermostat) will be a good idea?
Appreciate your thoughts/input.